Moisture indicator for paper making machines and pulp collecting machines and in similar apparatus



April 11, 1933. T. KALLE 1,903,716

, MOISTURE INDICATOR FOR PAPER MAKING MACHINES AND PULP COLLECTINGMACHINES AND IN SIMILAR APPARATUS Filed Feb. 9, 1928 e //VVENT'0,(

Patented Apr. 11, 1933 PATENT OFFICE TOBS'IEN IALLE, OF SAI'I'LE, SWEDENMOISTURE INDICATOR FOE PAPER IAIING IACHINES AND PULP COLLECTINGIACHINES AND IN SIIILAR APPARATUS Application filed February 9, 1828,Serial No. 258,195, and in Sweden April 18, 1927.

This inventionrelates to an apparatus for indicating and, it may be,recording the degree of moisture of a paper web passing through a papermaking machine in a semidry or nearly dry condltion and also variationsof the degree of moisture. The invention is'based upon the fact, that apaper web of constant thickness varies in plasticity or in itsresistance against bending,

1o folding or similar operation according as the de cc of moisturevaries, while the web passes. etween the press rollers and the dryingcylinders. For ascertaining the degree of moisture the web therefore,according to 1:; this invention, is led between members, which bend thesame into one or more folds or corrugations, the depth of which will bedependent on the degree of moisture of the web or the greater or lesserflexibility of the same, the mutual position of the said members be ingsimultaneously indicated by a pointer and a scale, an electricsignalling device or the like.

Fi s. 1, 2 and 3 in the accompanyin drawing s ow as examples three forms0 execution of the invention in side elevations and regarding Fig. 2partly in section.

1, Fig. 1, is a paper web shown in cross section, immediately behind thelast drying cylinder of the paper making machine. 2 and 3 are tworollers rovided with grooves and located above and below the'paper webrespectively and so displaced relatively to one another, that the ridgesof the one roller are located opposite to the grooves of the otherroller. The lower roller 3 is rotatably mounted on an arm 4, which bymeans of a contractible ring 5 is fixed to an upright 6. The upperroller 2 is rotatably mounted on the arm 7 of a two armed lever 7, 8,which is swingable on a pin 9, provided on an arm projecting from t ering 5, and in a plane transverse to the paper web and erpendicular tothe same. Arm 7 is provi ed with an adjustable weight 10, by means ofwhich the pressure of the roller 2 on the web 1 may be controlled. Anadjustable spring may, evidently, be substituted for the said weight.The second arm 8 of the lever is connected by means of a flexible band11 or the like to a swingably mounted toothed segment 12, which measureswith a pinion provided on the spring actuated spindle of the pointer 13cooperating with the scale of an indicating apparatus. The saidapparatus is carried by a rod 14 projecting from the ring 5. After thereleasing of the rin 5 the rollers 2 and 3 may swung away rom the paperweb, when Wanted.

In the form of execution of the invention shown in Fig. 2 the paper web1 passes between an upper, grooved roller 15 rotatably mounted on an arm16 which is pivoted at 17 and loaded by means of an adjustable weight18, and two rollers 19 and 20, which are journaled on an arm 21projecting from a ring 22 on an upright 23 and in a fork shaped member24 provided on the said arm 21. The roller 19 is retained on the arm 21by means of a flange or collar a and a nut b. A disc or roller 25 islocated between the said rollers l9 and 20 and journaled on an arm 26,which is swing-able on a pin 27 in the ring 22. The said arm 26 isswingable in a plane transverse to the paper web 1 and perpendicular tothe same. The disc 25 is located right below one of the ridges of theupper roller 15 and is forced upwards by a spring not shown. An electriccontact member 270:: is provided on an extension 28 of the arm 26 andco-operates with a stationary contact member 29 carried by the ring 22.

If the degree of moisture of the paper web 1 becomes greater thanwanted, while the web passes through the pa er making machine, the webwill be bent through a greater distance than before into the grooves ofthe rollers 2 and 3, Fig. 1, so that roller 2 descends to a positionnearer to the roller 3. During this changing of the position of theroller 2 the pointer 13 is shifted and indicates on the scale thegreater degree of moisture. The case is the inverse, when the degree ofmoisture of the paper web decreases. The web then is stiffer and thedeformation of the same more diificult, for which reason the web is bentin a less degree between the rollers 2 and3 and the roller 2 occupies ahigher position. The pointer 13 then indicates a lower degree ofmoisture. The position of the pointer 13 indicates the relative degreeof moisture of the paper web. variations of the degree of moisture ofthe web passing between the rollers are thus indicated, so that thedegree of moisture necessary for the most effective running of themachine may be ensured. The said variations may be recorded for instanceby a pointer being provided with pencil bearing against the indicatorpaper of a recording drum in the well known manner.

The mode of operating of the apparatus shown in Fig. 2 is analogous tothat of the apparatus shown in Fig. 1 with the exception that thegreater or less depression 0 the paper web and the vertical position ofthe roller 15 dependent thereof results in the disc 25 being shiftedthrough the action of the web. By means of the contact device 2700, 29 asi nalling apparatus, for instance, an electric bell 37 in a circuit 37amay be caused to operate, indicating that the normal degree of moisturehas been exceeded.

The invention may, evidently, be modified in many respects withoutexceeding the limits of the same. Thus in Fig. 3 a grooved roller 30co-operates with a drying cylinder 31 of the paper making machineprovided with grooves. The said roller 30 is carried by a loaded arm 32pivoted at 33 and provided with a contact member 3a, which co-operateswith a stationary contact member 35 on an arm 36. The contacts 3a and 35are in a circuit 38a including a lamp 38 which is operated whentheregular degree of moisture is exceeded.

The invention may be applied also to pulp collecting machines andsimilar machines. Regarding the contact device it may be used also forcontrolling the means which regulates the degree of moisture of paperweb.

I claim:

1. In means for indicating the degree of moisture of a travelling web ofmaterial the combination of a cylindrical member presenting a groovedsurface and rotatably mounted on a stationary support, a shiftablerotatable cylindrical member presenting a grooved surface, said memberseing located opposite to one another and at opposite sides of the web,the members being so positioned one with respect to the other that thegrooves of one are opposite the ridges of the other, means forcing theshiftable member toward the first mentioned member so that the positionof the shiftable member is dependent on the moisture of the web, anindicating device, and means for transmitting the motion of theshiftable member to the said device.

2. In means for indicating the degree of moisture of a travelling web ofmaterial the combination of a member presenting a grooved surface andmounted on a stationary support, a shiftable member presenting a groovedsurface, said members being 10- cated opposite to one another and atopposite sides of the web, the members being so positioned one withrespect to the other that the grooves of one are opposite the ridges ofthe other, means forcing the shiftable member toward the first mentionedmember so that the position of the shiftable member s dependent on themoisture of the web, an indicating device, and means for transmittingthe motion of the shiftable member to the said device.

3. In means for indicating the degree of moisture of a travelling web ofmaterial the combination of a member presenting a grooved surface andmounted on a stationary support, a shiftable member presenting a groovedsurface, said members being located opposite to one another and atopposite sides of the web, the members being so positioned one withrespect to the other, that the grooves of one are opposite the ridges ofthe other, means forcing the shiftable member toward the first mentionedmember, so that the position of the shiftable member is dependent on themoisture of the web, an indicating device, a second shiftable memberdisposed in proximity to the first mentioned member and located oppositea ridge of the shiftable member first men aioned, and means transmittingthe motion of the said second shiftable member to the indicating device.

In testimony whereof I have hereunto affixed my signature.

T. KiiLLE.

